Driving Apparatus of Display with Precharge Mechanism

1. A driving apparatus of a display, comprising: a digital-to-analog converting (DAC) circuit, for receiving a display data with a digital format, and generating a gray level voltage according to the display data; and an output buffer circuit, coupled to the DAC circuit, and having an output terminal to output an output signal, the output buffer circuit receiving the gray level voltage, a pre-charge enable signal and the output signal, the output buffer circuit provides a pre-charge output signal to the output terminal of the output buffer circuit according to the pre-charge enable signal and a comparison result of the gray level voltage and the output signal, and a voltage level of the pre-charge output signal is determined by the comparison result when the pre-charge enable signal is enabled.

2. The driving apparatus of the display as claimed in claim 1 , wherein the output buffer circuit comprises: a pre-charge circuit, for receiving the pre-charge enable signal and the comparison result, and providing the pre-charge output signal according to the comparison result when the pre-charge enable signal is enabled.

3. The driving apparatus of the display as claimed in claim 1 , wherein the output buffer circuit further receives an output enable signal, and outputs a driving output signal to the output terminal of the output buffer circuit according to the output enable signal.

4. The driving apparatus of the display as claimed in claim 3 , wherein the output buffer circuit is an operation amplifier, the operation amplifier has a first input terminal, a second input terminal, a pre-charge enable input terminal and an output terminal, wherein the first input terminal receives the gray level voltage, the second input terminal receives the driving output signal, the pre-charge enable input terminal receives the pre-charge enable signal, and the output signal outputs the driving output signal or the pre-charge output signal.

5. The driving apparatus of the display as claimed in claim 4 , wherein the operation amplifier comprises a differential pair, and input terminals of the differential pair respectively receive the gray level voltage and the output signal, so as to compare the gray level voltage and the output signal to generate the comparison result.

6. The driving apparatus of the display as claimed in claim 1 , wherein the DAC circuit is a voltage selector, and the voltage selector selects to output one of a plurality of voltages according to the display data.